Ju Wang, Ting Jia, Shuaishuai Wang, Tianyu Li, Chuang Ma, Tianyuan Xie, Yang Yu, Jinlong Yu. Wavelength synchronization technology for UDWDM-PON transmitter based on injection locking[J]. Chinese Optics Letters, 2021, 19(1): 010602
- Chinese Optics Letters
- Vol. 19, Issue 1, 010602 (2021)
Fig. 1. Downlink and uplink wavelength references synchronization scheme in UDWDM-PON. MLL, mode-locked laser; RF, radio frequency; MZM, Mach–Zehnder modulator.
Fig. 2. Schematic diagram of automatic wavelength locking and tracking. Detector, envelope detector; MCU, microcontroller unit.
Fig. 4. Setup of injection locking dual references applying automatic locking and tracking technology. RF, radio frequency source; AMP, power amplifier; ESA, electrical spectrum analyzer; OSA, optical spectrum analyzer; ATT, attenuator.
Fig. 5. Power variation of beat signal.
Fig. 5. Results of automatically separating dual references. (a) Optical spectrum of the OFC and output of DFB1 laser and (b) electric spectrum with 400 kHz span.
Fig. 7. (a) Wavelength fluctuation contrast with and without automatic locking and tracking technology, (b) 5 GHz beat signal power fluctuations, and (c) optical spectrum of dual wavelength references automatical locking.
Fig. 8. Process of automatically tracking wavelengths. (a) Tracking process of DFB1 laser wavelength, (b) DFB1 laser 5 GHz beat signal power variation, (c) tracking process of DFB2 laser wavelength, and (d) DFB2 laser 5 GHz beat signal power variation.
Fig. 9. Schematic diagram of wavelength synchronization for UDWDM-PON based on automatic wavelength locking and tracking technology. PRBS, pseudo-random binary sequence; EDFA, erbium-doped fiber amplifier; OF, optical filter.
Fig. 10. Optical spectrum of OLT based on channel automatic locking and tracking technology. (a) Optical spectrum of coupler 10 output and (b) wavelength fluctuations of eight channels within 20 min.
Fig. 11. (a) Optical spectrum of downstream data signal. (b) Optical spectrum after DFB6 laser locking.
Fig. 12. (a) Output signal of DFB6 laser. (b) Recovered signal.
Fig. 13. BER of wavelength synchronization system.
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